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I deleted some versions that I had previously downloaded and when I started up the launcher it said everything was loading. I left it for three hours and it still says the same thing. When I go to Profile Editor it shows a blank screen. I can't even start up my game. My game is modded, but the mods I use have never, ever caused a problem. The versions I deleted are; 1.7.2 vanilla, 1.7.2 forge, 1.6.4 vanilla, 1.6.4 forge, 1.6.4 liteloader. The launcher log said this:
[17:55:14 INFO]: Minecraft Launcher 1.6.11 (through bootstrap 100) started on windows...
[17:55:14 INFO]: Current time is Mar 15, 2015 5:55:14 PM
[17:55:14 INFO]: System.getProperty('os.name') == 'Windows 8.1'
[17:55:14 INFO]: System.getProperty('os.version') == '6.3'
[17:55:14 INFO]: System.getProperty('os.arch') == 'amd64'
[17:55:14 INFO]: System.getProperty('java.version') == '1.8.0_25'
[17:55:14 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[17:55:14 INFO]: System.getProperty('sun.arch.data.model') == '64'
[17:55:14 INFO]: proxy == DIRECT
[17:55:14 INFO]: JFX is already initialized
[17:55:15 INFO]: Refreshing local version list...
[17:55:16 INFO]: Refreshing remote version list...
[17:55:18 INFO]: Refresh complete.
[17:55:18 ERROR]: Unexpected exception refreshing profile list
java.lang.IllegalArgumentException: Version cannot be null
at net.minecraft.launcher.updater.VersionList.getCompleteVersion(VersionList.java:61) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:210) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.CompleteMinecraftVersion.resolve(CompleteMinecraftVersion.java:253) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.CompleteMinecraftVersion.resolve(CompleteMinecraftVersion.java:240) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getVersionSyncInfo(MinecraftVersionManager.java:169) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getVersions(MinecraftVersionManager.java:103) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.game.GameLaunchDispatcher.getStatus(GameLaunchDispatcher.java:35) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.ui.bottombar.PlayButtonPanel.checkState(PlayButtonPanel.java:94) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.ui.bottombar.PlayButtonPanel.onProfilesRefreshed(PlayButtonPanel.java:90) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.profile.ProfileManager.fireRefreshEvent(ProfileManager.java:83) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.profile.ProfileManager.loadProfiles(ProfileManager.java:71) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.Launcher$2.run(Launcher.java:138) [launcher.jar:1.6.11]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_25]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_25]
[17:55:18 INFO]: Refreshing auth...
[17:55:18 INFO]: Logging in with access token
[17:55:18 FATAL]: Unhandled exception in thread Thread[AWT-EventQueue-0,6,main]
java.lang.IllegalArgumentException: Version cannot be null
at net.minecraft.launcher.updater.VersionList.getCompleteVersion(VersionList.java:61) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:210) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.CompleteMinecraftVersion.resolve(CompleteMinecraftVersion.java:253) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.CompleteMinecraftVersion.resolve(CompleteMinecraftVersion.java:240) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getVersionSyncInfo(MinecraftVersionManager.java:169) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getVersions(MinecraftVersionManager.java:103) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.ui.bottombar.PlayerInfoPanel.checkState(PlayerInfoPanel.java:96) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.ui.bottombar.PlayerInfoPanel$2.run(PlayerInfoPanel.java:78) ~[launcher.jar:1.6.11]
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) ~[?:1.8.0_25]
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744) ~[?:1.8.0_25]
at java.awt.EventQueue.access$400(EventQueue.java:97) ~[?:1.8.0_25]
at java.awt.EventQueue$3.run(EventQueue.java:697) ~[?:1.8.0_25]
at java.awt.EventQueue$3.run(EventQueue.java:691) ~[?:1.8.0_25]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) ~[?:1.8.0_25]
at java.awt.EventQueue.dispatchEvent(EventQueue.java:714) ~[?:1.8.0_25]
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) [?:1.8.0_25]
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) [?:1.8.0_25]
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) [?:1.8.0_25]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) [?:1.8.0_25]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) [?:1.8.0_25]
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) [?:1.8.0_25]
[17:55:19 ERROR]: Unhandled exception in executor com.mojang.launc[email protected]565b29a
java.util.concurrent.ExecutionException: java.lang.IllegalArgumentException: Version cannot be null
at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_25]
at com.mojang.launcher.updater.ExceptionalThreadPoolExecutor$ExceptionalFutureTask.done(ExceptionalThreadPoolExecutor.java:58) [launcher.jar:1.6.11]
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:384) [?:1.8.0_25]
at java.util.concurrent.FutureTask.setException(FutureTask.java:251) [?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:271) [?:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_25]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_25]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_25]
Caused by: java.lang.IllegalArgumentException: Version cannot be null
at net.minecraft.launcher.updater.VersionList.getCompleteVersion(VersionList.java:61) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:210) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.CompleteMinecraftVersion.resolve(CompleteMinecraftVersion.java:253) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.CompleteMinecraftVersion.resolve(CompleteMinecraftVersion.java:240) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getVersionSyncInfo(MinecraftVersionManager.java:169) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getVersions(MinecraftVersionManager.java:103) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.game.GameLaunchDispatcher.getStatus(GameLaunchDispatcher.java:35) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.ui.bottombar.PlayButtonPanel.checkState(PlayButtonPanel.java:94) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.ui.bottombar.PlayButtonPanel.onProfilesRefreshed(PlayButtonPanel.java:90) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.profile.ProfileManager.fireRefreshEvent(ProfileManager.java:83) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.Launcher.ensureLoggedIn(Launcher.java:220) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.Launcher$2.run(Launcher.java:168) ~[launcher.jar:1.6.11]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_25]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_25]
... 3 more
[17:55:19 FATAL]: Unhandled exception in thread Thread[AWT-EventQueue-0,6,main]
java.lang.IllegalArgumentException: Version cannot be null
at net.minecraft.launcher.updater.VersionList.getCompleteVersion(VersionList.java:61) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getLatestCompleteVersion(MinecraftVersionManager.java:210) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.CompleteMinecraftVersion.resolve(CompleteMinecraftVersion.java:253) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.CompleteMinecraftVersion.resolve(CompleteMinecraftVersion.java:240) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getVersionSyncInfo(MinecraftVersionManager.java:169) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.updater.MinecraftVersionManager.getVersions(MinecraftVersionManager.java:103) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.ui.bottombar.PlayerInfoPanel.checkState(PlayerInfoPanel.java:96) ~[launcher.jar:1.6.11]
at net.minecraft.launcher.ui.bottombar.PlayerInfoPanel$2.run(PlayerInfoPanel.java:78) ~[launcher.jar:1.6.11]
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) ~[?:1.8.0_25]
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744) ~[?:1.8.0_25]
at java.awt.EventQueue.access$400(EventQueue.java:97) ~[?:1.8.0_25]
at java.awt.EventQueue$3.run(EventQueue.java:697) ~[?:1.8.0_25]
at java.awt.EventQueue$3.run(EventQueue.java:691) ~[?:1.8.0_25]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_25]
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) ~[?:1.8.0_25]
at java.awt.EventQueue.dispatchEvent(EventQueue.java:714) ~[?:1.8.0_25]
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) [?:1.8.0_25]
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) [?:1.8.0_25]
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) [?:1.8.0_25]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) [?:1.8.0_25]
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) [?:1.8.0_25]
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) [?:1.8.0_25]

How do I fix this? Please help me.

Thanks for the reply. I got it fixed through the administrator account on my PC.